Scientific American ’s Dina Maron talks with Keiji Fukuda, assistant director general for health security at the World Health Organization, about the current Ebola outbreak, the threat of sexual transmission and the hope for a vaccine. They were both at an Institute of Medicine Forum on Microbial Threats held at the Pan American Health Organization in Washington, D.C., concentrating on Ebola in west Africa.

University of Exeter archaeologist José Iriarte talks to freelance journalist Cynthia Graber about his efforts to understand human activity in and influence on the Amazon region for the last 13 millennia

In conjunction with this magazine's inclusion on the March 12 episode of The Big Bang Theory , here's an edited version of a talk by the sitcom's science advisor, U.C.L.A. physicist David Saltzberg, about his role and the show's reach

Scientific American health and medicine correspondent Dina Fine Maron talks with Armand Sprecher of Doctors Without Borders, who has fought Ebola in Guinea and Liberia. And Steve talks Ebola with Stanford's David Relman, chair of the Forum on Microbial Threats of the Institute of Medicine

Scientific American health and medicine correspondent Dina Fine Maron talks about Ebola with tropical medicine and infectious disease expert Daniel Bausch of Tulane University at the annual meeting of the American Society of Tropical Medicine and Hygiene